Proxy problems when using subdirectory

[H Plato <hplato@xxxxxxxxx>]

I’m having problems getting a reverse proxy to work as a subdirectory. Using the following configuration, Apache can full proxy an internal site:

<VirtualHost 192.168.0.50:80>
	ServerName www.domain.com
 	DocumentRoot /data/www/www
 	ErrorLog /var/log/apache2/www_error_log
 	TransferLog /var/log/apache2/www_access_log

	<Directory "/">
		Options Indexes FollowSymLinks ExecCGI
	 	AllowOverride AuthConfig
                Order allow,deny
		Allow from all
		AllowOverride All
		Require all granted
	</Directory> 

       ProxyRequests Off
       ProxyPass / http://192.168.0.51:80/ 
       ProxyPassReverse / http://192.168.0.51:80/ 
       ServerAlias www.proxy.domain.com
       ServerName proxy.domain.com
	
</VirtualHost>

However, when I change the proxy statements to use a subdomain:

       ProxyPass /a/ http://192.168.0.51:80/ 
       ProxyPassReverse /a/ http://192.168.0.51:80/ 

 then I get inconsistent results. Any link on the internal site that has root link (i.e.. href=“/docs” ) none of these are proxied to /a/docs. Any link with a relative link (i.e. href=“docs”) works.

I’m using Ubuntu 14.04.1 with  Apache/2.4.7 (Ubuntu) Server built:   Jul 22 2014 14:36:38

I’ve been struggling with this for days, so any ideas or help would be greatly appreciated.



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